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Summary

Summary IT Theory - Networking

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2023/2024 Written for academic year
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12th Grade
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Full summary, according to SAGS document, of IEB Information Technology Theory - Networking section.

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NETWORKING
Network =
nodes connected
by some
type of communication channel


Node= any device connected to a network


Server
= to clients
~print
-
web
a central network computer that provides resources a service - file
-email
I
Client
=
a computer that receives a service proxy

Switch= a device that connects nodes using communication media


Router =
small electronic device that joins computer networks together (that use the same protocols)

Firewall -
Hw+Isw that prevents unauthorised access tol from a private network

Repeater-connects network
segments
+ boosts
signal strength (wo
checking destination (
smart repeater
* it

Bridge =
connects network
segments , boosts signal strength , checks MAC address +
only sends where it needs to
go
NIC (Network Interface Card) =
physical interface/connection btwn computer and network Cable




Types of networks
PAN (Personal Area Network) - individual (personal devices

LAN (Local Area Network) limited location
physical
WAN (wide Area Network) -> different cities /countries interconnected LANS
,



GAN (Global Area Network)
P Worldwide - Internet




Reasons to use networks (/advantages)
↳ communication

↳
access to sharing resources

↳ centralisation

↳ data
transfer

↳
productivity
↳ file
sharing +
storage
↳ network
application
↳
productivity


Disadvantages of networks
↳
security issues

↳
spread of computer viruses

↳ cost

↳
dependency on central servers

,

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